Fig. 3From: Dominant Influence of Interface Roughness Scattering on the Performance of GaN Terahertz Quantum Cascade LasersSimulated maximum optical gain vs frequency and current-electric field simulations for different IFR. a Simulated maximum optical gain vs frequency for different IFR. b Current-electric field simulations of the GaN THz QCL taking account different IFR. Temperature is set at 10 KBack to article page